Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 368 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 34 × 23 = 782. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 71 × 31 = 2201. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 35 × 66 = 2310. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 389 + 505 = 895. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 126 + 125 = 251. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 72 × 61 = 4396. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 15 × 62 = 931. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 36 × 45 = 1617. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 72 × 62 = 4468. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 25 × 27 = 675. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 23 × 79 = 1816. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 46 × 65 = 2990. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 88 × 50 = 4400. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 27 × 34 = 921. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 94 × 51 = 4795. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 403 + 586 = 989. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 71 × 35 = 2485. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 73 × 40 = 2928. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 698 + 265 = 961. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 76 × 49 = 3724. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 84 × 37 = 3108. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 58 × 70 = 4060. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 53 × 82 = 4346. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 344 + 836 = 1172. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 965 + 913 = 1878. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 659 + 332 = 991. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 86 × 98 = 8428. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 17 × 81 = 1377. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 992 + 178 = 1165. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 238 + 846 = 1084. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 397 + 661 = 1050. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 40 × 69 = 2760. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 57 × 40 = 2280. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 318 + 638 = 956. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 160 + 565 = 725. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 18 × 92 = 1653. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 685 + 571 = 1256. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 977 + 614 = 1583. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 34 × 27 = 918. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 964 + 555 = 1519. Correct or wrong? (a) wrong (b) correct

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